<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HTML+CSS(外联式)</title>
    <!-- 关系：样式表 -->
    <link rel="stylesheet" href="./hello.css">
</head>
<body>
    <!-- css写在哪 -->
    <p>Hello World</p>
</body>
</html>